About Rafal Borowiec

Rafal is an IT specialist with about 8 years of commercial experience, specializing in software testing and quality assurance, software development, project management and team leadership.

Spring 4: @DateTimeFormat with Java 8 Date-Time API

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@DateTimeFormat annotation that was introduced in Spring 3.0 as a part of Formatter SPI can be used to to parse and print localized field values in web applications. In Spring 4.0, @DateTimeFormat annotation can be used with Java 8 Date-Time API (java.time) out-of-the-box, without extra effort.

In Spring, field formatting can be configured by field type or annotation. To bind an annotation to a formatter AnnotationFormatterFactory must be implemented. Spring 4.0 brings Jsr310DateTimeFormatAnnotationFormatterFactory that formats Java 8 Date-Time fields annotated with the @DateTimeFormat. Supported field types are as follows:

  • java.util.LocalDate
  • java.util.LocalTime
  • java.util.LocalDateTime
  • java.util.ZonedDateTime
  • java.util.OffsetDateTime
  • java.util.OffsetTime

One can utilize all mentioned types in a form like below:

public class DatesForm {

    @DateTimeFormat(iso = ISO.DATE)
    private LocalDate localDate;

    @DateTimeFormat(iso = ISO.TIME)
    private LocalTime localTime;

    @DateTimeFormat(iso = ISO.TIME)
    private OffsetTime offsetTime;

    @DateTimeFormat(iso = ISO.DATE_TIME)
    private LocalDateTime localDateTime;

    @DateTimeFormat(iso = ISO.DATE_TIME)
    private ZonedDateTime zonedDateTime;

    @DateTimeFormat(iso = ISO.DATE_TIME)
    private OffsetDateTime offsetDateTime;
    
}

The form can be passed to the view and Spring will take care of proper formatting of the fields.

datetimeformat-spring-4-java-8-1

While specifying the formatting on the fields of types: java.util.LocalDate, java.util.LocalTime, java.util.OffsetTime you need to remember to properly configure @DateTimeFormat.

@DateTimeFormat declares that a field should be formatted as a date time and since java.util.LocalDate represents a date, and the other two represent time – you will get java.time.temporal.UnsupportedTemporalTypeException (e.g.: Unsupported field: ClockHourOfAmPm, Unsupported field: MonthOfYear) thrown by java.time.format.DateTimeFormatter.

Reference: Spring 4: @DateTimeFormat with Java 8 Date-Time API from our JCG partner Rafal Borowiec at the Codeleak.pl blog.
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